Back to results
US 7,621,825 B2Granted
Thermoplastic core having a negative hardness gradient formed from a plasticizer-based gradient-initiating solution
AssigneeAcushnet Company
InventorsMichael J. Sullivan, David A. Bulpett, Brian Comeau
Life of this patent
Estimating the term…
Abstract
A golf ball comprising a thermoplastic core, the core having an outer diameter of 1.51 inches to 1.59 inches and having an outer surface and a geometric center, each having a hardness; an outer cover layer; and an inner cover layer disposed between the core and the outer cover layer; wherein the hardness of the outer surface is less than the hardness of the geometric center to define a “negative” hardness gradient of 5 Shore C or greater.
Claims10
A golf ball comprising:
- a core consisting essentially of a thermoplastic material, the core having an outer diameter of 1.51 inches to 1.59 inches and having an outer surface and a geometric center, each having a hardness;
- an outer cover layer;
- and
- an inner cover layer disposed between the core and the outer cover layer;
- wherein the hardness of the outer surface is less than the hardness of the geometric center to define a negative hardness gradient of 5 Shore C or greater;
- and
- wherein the thermoplastic material comprises an ionomer, a highly-neutralized ionomer, a thermoplastic polyurethane, a thermoplastic polyurea, a styrene block copolymer, a polyester amide, polyester ether, a polyethylene acrylic acid copolymer or terpolymer, or a polyethylene methacrylic acid copolymer or terpolymer.
4 more elements
Dependencies are inferred from the claim text.